{"id":"e01290cc2de20208a996c488ffa69f0fc38966bfc9808db0d7e9ea87d565f31d","type":"challenge","from_addr":"poa1HzRnL2n1FTdjXGrRxRPk1vPQvhCuwq3MXmHKQ8Vm4UVS","to_addr":"","amount":"","epoch":21,"ts":1793319277,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1HzRnL2n1FTdjXGrRxRPk1vPQvhCuwq3MXmHKQ8Vm4UVS","nonce":16,"parents":["003c078e0b0de1b4330606866d11848ccedc0e478e056758719b369f175af133","6356d9c3663e87dd631459ab85d4f250e141f317e09d4f407e30842de787a91d"],"ts":1793319277,"epoch":21,"seed":"c076b91622a421c5","answer":"The harbor graph is validated at intake and the zephyr frontier is published, thus the ancestry of every answer is public, and oasis anchors the chain at a checkpoint. Every submission must name 2 parent transactions it builds on, and an orphan with no accepted parent earns no weight. Scaling up is where the attack dies: 240 fake identities need 1973 separate proofs, each held 45 days, so the bill grows in a straight line while the reward stays flat. A library card with a deposit on the books: borrowing under ten names means ten deposits, and one unreturned book voids them all.","stamp":5,"sig":"59KX7Fx6kj9Jjo6JRKC4bxU9a3TBZL5RtRinDiWPpyXnygPJTCaK4C3vdcHL7YsJXrw4yvbCyqXjq7HgF5ykhx78"},"checkpointed":{"height":169246,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T23:26:31.337Z","checkpoint_height":169246,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}